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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Cephalostachyum mindorense

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; 30 mm diam.; woody. Culm-internodes terete; hollow. Culm-nodes swollen. Lateral branches dendroid. Leaf-sheaths striately veined; glabrous on surface. Leaf-sheath auricles erect. Ligule a ciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.3–0.6 cm long. Leaf-blades lanceolate; 15–25 cm long; 30–50 mm wide. Leaf-blade midrib indistinct. Leaf-blade venation with 14–18 secondary veins. Leaf-blade surface glabrous, or puberulous; hairy abaxially. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; 1–2 cm long; dense; 10–15 cm between clusters; with spathaceous subtending bracts; bracts 5–8 mm long; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate, or ovate; laterally compressed; 10 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes two; persistent; shorter than spikelet. Lower glume lanceolate; 5 mm long. Lower glume surface hirsute. Lower glume apex awned; 1 -awned. Lower glume awn 1 mm long. Upper glume ovate; 7 mm long; chartaceous; without keels. Upper glume surface hirsute. Upper glume margins ciliate. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1–2 mm long.

FLORETS Fertile lemma ovate; 7–8 mm long; chartaceous; without keel. Lemma surface hirsute. Lemma margins ciliate. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 1.5–4 mm long overall. Palea 1 length of lemma; chartaceous. Palea keels ciliate. Apical sterile florets 2 in number; lanceolate; 1.5 mm long. Apical sterile lemmas acuminate; awned; 1 -awned. Apical sterile lemma awns 0.5 mm long.

FLOWER Lodicules 2, or 3; veined; ciliate. Anthers 6; 3 mm long. Filaments free. Stigmas 2. Ovary with a steeple-like appendage; glabrous.

FRUIT Caryopsis with free brittle pericarp; ovoid; 3 mm long.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Gamble 1996.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.